Non embeddable CR-structures
Journées équations aux dérivées partielles (1981), article no. 8, 8 p. 
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     author = {Tr\`eves, Fran\c{c}ois},
     title = {Non embeddable {CR-structures}},
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     pages = {1--8},
     publisher = {Ecole polytechnique},
     year = {1981},
     zbl = {0492.32024},
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     url = {http://archive.numdam.org/item/JEDP_1981____A8_0/}
}
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Trèves, François. Non embeddable CR-structures. Journées équations aux dérivées partielles (1981), article  no. 8, 8 p. http://archive.numdam.org/item/JEDP_1981____A8_0/

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